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问题: 一些简单的选择题

1.He doesn't know ( ).
A.how to do B.what to do it
C.when to do it D.where to go there
2.People are not allowed ( )here
A.smoking B.to smoke C.to smoking D.smokes
(请详细说明一下为什么选,谢谢!)

解答:

第一题C,很简单,
A的话该how to do it? it是how怎么的宾语

B的话该what to do ? 这句话宾语what前置,应此加it就累赘了

D的话不该加there,there本身就表方位了,再问在哪,不显得逻辑紊乱了吗?

第2题的大按是B
be allowed to do 嘛!根本就没 be allowed doing 的!!!